1 files changed, 209 insertions, 0 deletions
diff --git a/layout/xul/nsStackLayout.cpp b/layout/xul/nsStackLayout.cpp
new file mode 100644
index 0000000000..2a377a07f9
--- /dev/null
+++ b/layout/xul/nsStackLayout.cpp
@@ -0,0 +1,209 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+//
+// Eric Vaughan
+// Netscape Communications
+//
+// See documentation in associated header file
+//
+
+#include "nsStackLayout.h"
+#include "nsCOMPtr.h"
+#include "nsBoxLayoutState.h"
+#include "nsBoxFrame.h"
+#include "nsGkAtoms.h"
+#include "nsIContent.h"
+#include "nsNameSpaceManager.h"
+
+using namespace mozilla;
+
+nsBoxLayout* nsStackLayout::gInstance = nullptr;
+
+nsresult NS_NewStackLayout(nsCOMPtr<nsBoxLayout>& aNewLayout) {
+  if (!nsStackLayout::gInstance) {
+    nsStackLayout::gInstance = new nsStackLayout();
+    NS_IF_ADDREF(nsStackLayout::gInstance);
+  }
+  // we have not instance variables so just return our static one.
+  aNewLayout = nsStackLayout::gInstance;
+  return NS_OK;
+}
+
+/*static*/
+void nsStackLayout::Shutdown() { NS_IF_RELEASE(gInstance); }
+
+nsStackLayout::nsStackLayout() = default;
+
+/*
+ * Sizing: we are as wide as the widest child
+ * we are tall as the tallest child.
+ */
+
+nsSize nsStackLayout::GetXULPrefSize(nsIFrame* aBox, nsBoxLayoutState& aState) {
+  nsSize prefSize(0, 0);
+
+  nsIFrame* child = nsIFrame::GetChildXULBox(aBox);
+  while (child) {
+    nsSize pref = child->GetXULPrefSize(aState);
+
+    AddXULMargin(child, pref);
+
+    if (pref.width > prefSize.width) {
+      prefSize.width = pref.width;
+    }
+    if (pref.height > prefSize.height) {
+      prefSize.height = pref.height;
+    }
+
+    child = nsIFrame::GetNextXULBox(child);
+  }
+
+  AddXULBorderAndPadding(aBox, prefSize);
+
+  return prefSize;
+}
+
+nsSize nsStackLayout::GetXULMinSize(nsIFrame* aBox, nsBoxLayoutState& aState) {
+  nsSize minSize(0, 0);
+
+  nsIFrame* child = nsIFrame::GetChildXULBox(aBox);
+  while (child) {
+    nsSize min = child->GetXULMinSize(aState);
+
+    AddXULMargin(child, min);
+
+    if (min.width > minSize.width) {
+      minSize.width = min.width;
+    }
+    if (min.height > minSize.height) {
+      minSize.height = min.height;
+    }
+
+    child = nsIFrame::GetNextXULBox(child);
+  }
+
+  AddXULBorderAndPadding(aBox, minSize);
+
+  return minSize;
+}
+
+nsSize nsStackLayout::GetXULMaxSize(nsIFrame* aBox, nsBoxLayoutState& aState) {
+  nsSize maxSize(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
+
+  nsIFrame* child = nsIFrame::GetChildXULBox(aBox);
+  while (child) {
+    nsSize min = child->GetXULMinSize(aState);
+    nsSize max = child->GetXULMaxSize(aState);
+
+    max = nsIFrame::XULBoundsCheckMinMax(min, max);
+
+    AddXULMargin(child, max);
+
+    if (max.width < maxSize.width) {
+      maxSize.width = max.width;
+    }
+    if (max.height < maxSize.height) {
+      maxSize.height = max.height;
+    }
+
+    child = nsIFrame::GetNextXULBox(child);
+  }
+
+  AddXULBorderAndPadding(aBox, maxSize);
+
+  return maxSize;
+}
+
+nscoord nsStackLayout::GetAscent(nsIFrame* aBox, nsBoxLayoutState& aState) {
+  nscoord vAscent = 0;
+
+  nsIFrame* child = nsIFrame::GetChildXULBox(aBox);
+  while (child) {
+    nscoord ascent = child->GetXULBoxAscent(aState);
+    nsMargin margin;
+    child->GetXULMargin(margin);
+    ascent += margin.top;
+    if (ascent > vAscent) vAscent = ascent;
+
+    child = nsIFrame::GetNextXULBox(child);
+  }
+
+  return vAscent;
+}
+
+NS_IMETHODIMP
+nsStackLayout::XULLayout(nsIFrame* aBox, nsBoxLayoutState& aState) {
+  nsRect clientRect;
+  aBox->GetXULClientRect(clientRect);
+
+  bool grow;
+
+  do {
+    nsIFrame* child = nsIFrame::GetChildXULBox(aBox);
+    grow = false;
+
+    while (child) {
+      nsMargin margin;
+      child->GetXULMargin(margin);
+      nsRect childRect(clientRect);
+      childRect.Deflate(margin);
+
+      if (childRect.width < 0) childRect.width = 0;
+
+      if (childRect.height < 0) childRect.height = 0;
+
+      nsRect oldRect(child->GetRect());
+      bool sizeChanged = !oldRect.IsEqualEdges(childRect);
+
+      // only lay out dirty children or children whose sizes have changed
+      if (sizeChanged || child->IsSubtreeDirty()) {
+        // add in the child's margin
+        nsMargin margin;
+        child->GetXULMargin(margin);
+
+        // Now place the child.
+        child->SetXULBounds(aState, childRect);
+
+        // Flow the child.
+        child->XULLayout(aState);
+
+        // Get the child's new rect.
+        childRect = child->GetRect();
+        childRect.Inflate(margin);
+
+        // Did the child push back on us and get bigger?
+        if (childRect.width > clientRect.width) {
+          clientRect.width = childRect.width;
+          grow = true;
+        }
+
+        if (childRect.height > clientRect.height) {
+          clientRect.height = childRect.height;
+          grow = true;
+        }
+      }
+
+      child = nsIFrame::GetNextXULBox(child);
+    }
+  } while (grow);
+
+  // if some HTML inside us got bigger we need to force ourselves to
+  // get bigger
+  nsRect bounds(aBox->GetRect());
+  nsMargin bp;
+  aBox->GetXULBorderAndPadding(bp);
+  clientRect.Inflate(bp);
+
+  if (clientRect.width > bounds.width || clientRect.height > bounds.height) {
+    if (clientRect.width > bounds.width) bounds.width = clientRect.width;
+    if (clientRect.height > bounds.height) bounds.height = clientRect.height;
+
+    aBox->SetXULBounds(aState, bounds);
+  }
+
+  return NS_OK;
+}